[C++]监控特定文件夹的事件：三种解决方法汇总

piperzero

<iframe align="top" marginwidth="0" marginheight="0" src="http://www.zealware.com/csdnblog01.html" frameborder="0" width="728" scrolling="no" height="90"></iframe><div class="postText">监控特定文件夹的事件：三种解决方法汇总<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

LDBIVR程序中要监视特定文件夹的文件落地或者删除事件，本来要用SHELL中的事件通知机制，后来因为要考虑到各种意外事件，如服务意外退出、服务器崩溃等，遂作罢。

对于目录事件异步通知，大致有三个方法：

调用Windows的api函数ReadDirectoryChanges监视指定目录中文件（推荐使用），这个使用异步IO：

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/readdirectorychangesw.asp

The ReadDirectoryChangesW function retrieves information that describes the changes within a directory.

To track changes on a volume, see change journals.

BOOL ReadDirectoryChangesW(

HANDLE hDirectory,

LPVOID lpBuffer,

DWORD nBufferLength,

BOOL bWatchSubtree,

DWORD dwNotifyFilter,

LPDWORD lpBytesReturned,

LPOVERLAPPED lpOverlapped,

LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine

);

或者用SHChangeNotifyRegister和SHChangeNotifyDeregister来注册事件SHChangeNotify：

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/functions/shchangenotify.asp

SHChangeNotify Function

<div style="margin: 0cm 0cm 0pt; text-align: center;" class="MsoNormal">